Lunch box



FIG. 1 is a top front left perspective view of a lunch box showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a top back right perspective view of the lunch box of FIGS. 1-7 in an alternate configuration of use.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a lunch box, as shown and described. 